First perform all the basics like changing the thermostat and radiator cap.
Either of those could cause overheat problems with plenty of coolant in the
system. If that doesn't work, check your airflow through the radiator
(blocked by leaves or other crud or all the fins bent over) and the proper
function of the radiator fan (could be a bad fan motor or thermostatic
control switch). Lastly, you may need to get your water pump checked and
the radiator flow tested to make sure it's not full of sediment and other
crud on the inside. A good radiator shop should be able to diagnose your
problem fairly quickly.
Cheers - Jonathan
There are at least two possibilities
The thermostat is not opening up when it should allowing the engine to get
very hot before it finally does open and gets back to normal.
The sending unit is defective.
In my case, the needle went to the end and stayed there for anywhere from a
minute to an hour. Your is probably a bit different.
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